Transient compensation method and system for nitrogen oxide discharging of automobile engine
An automotive engine and compensation method technology, applied in engine components, combustion engines, machines/engines, etc., can solve serious problems that affect emission control, nitrogen oxides and particle emissions, etc., to improve emission control and OBD monitoring accuracy, The effect of reducing errors
Active Publication Date: 2013-04-03
WEICHAI POWER CO LTD
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Problems solved by technology
But there is also a more serious problem: nitrogen oxides and particulate emissions are more serious
This will affect emission control and on-board diagnostic system (On-Board Diagnostics, OBD) monitoring, there are deficiencies and hidden dangers
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Embodiment 1
[0055] This embodiment provides a transient compensation method for nitrogen oxide emissions from automobile engines, the basic flow of which is as follows figure 2 shown, including the following steps:
[0056] Step S21 , acquiring the fuel injection quantity, the engine speed, the intake air quantity, the speed change rate, the fuel injection quantity change rate and the intake air quantity change rate.
[0057] First, get the engine speed n, fuel injection quantity g, intake air quantity m, phi as the advance angle, and p as the rail pressure;
[0058] Then, calculate n, g, m, phi, and p per unit time, and obtain the rate of change of rotational speed, rate of change of fuel injection quantity, rate of change of intake air quantity, rate of change of fuel injection advance angle, and rate of change of fuel injection pressure as follows:
[0059] dn dt , dg dt , dm ...
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The embodiment of the invention discloses a transient compensation method and a transient compensation system for nitrogen oxide discharging of an automobile engine. The method comprises the following steps of: acquiring fuel charge and engine speed, inquiring a steady state MAP to acquire steady state discharge of a nitrogen oxide, and determining the discharge as a basic value; determining rotation speed change rate, oil injection change rate, air inflow change rate, oil injection angular advance change rate, and oil injection pressure change rate; correcting the acquired values according to preset correction factors respectively; and taking the corrected values as the nitrogen oxide original discharge of the automobile engine. In the method and the system, critical factors influencing discharge are corrected, and the basic value acquired by inquiring the MAP table is compensated by the correct results, so that the calculated error between NOx concentration and actual concentration in a transient cycle is reduced, and basis is provided for subsequent improvement on discharge control and on-board diagnostics (OBD) monitoring accuracy.
Description
technical field [0001] The invention relates to the technical field of automobiles, in particular to a transient compensation method and system for nitrogen oxide (NOx) emissions of automobile engines. Background technique [0002] Automobile engines are generally divided into gasoline engines and diesel engines. Compared with gasoline engines, diesel engines have obvious advantages in terms of power, economy and reliability. But there is also a more serious problem: nitrogen oxides and particulate emissions are more serious. With the increasingly stringent emission standards, it is necessary to further reduce the emission of nitrogen oxides and particles. However, due to the performance and oil quality problems of domestic diesel engines, it is already insufficient to rely solely on internal purification measures. Therefore, external after-treatment technology has emerged as the times require. [0003] Among various off-machine after-treatment technologies, Selective Catal...
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IPC IPC(8): F01N11/00
CPCY02T10/47Y02T10/40
Inventor 王秀雷孟媛媛桑海浪杨双宾赵金光孔祥花刘栋刘兴义李大明胡广地
Owner WEICHAI POWER CO LTD